<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.transformation.combined.3d.transforms</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
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<body class="show_output">

<h1>2d.transformation.combined.3d.transforms</h1>
<p class="desc">perspective and rotate3d work together</p>


<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<p class="output expectedtext">Expected output:<p><img src="/images/green-100x50.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("perspective and rotate3d work together");
_addTest(function(canvas, ctx) {

ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50);

// Create a perspective transform in combiation with fillRect to draw a red
// trapezoid then draw a smaller green trapezoid inside it.
ctx.translate(50, 5);
ctx.perspective(100);
ctx.rotate3d(Math.PI/4, 0, 0);
ctx.fillStyle = "#f00";
ctx.fillRect(-30, 0, 60, 40);
ctx.fillStyle = "#0f0";
ctx.fillRect(-15, 10, 30, 20);

// These are the expected points of those two trapezoids from putting
// the corners of the filled rectangles through the perspective transform.
const bigTrapezoid = [[81, 5], [93, 45], [7, 45], [19, 5]];
const smallTrapezoid = [[32, 31], [68, 31], [65, 13], [35, 13]];

// Now filling a shape with green at those exact points with an identity
// transform should result in a purely green image.
ctx.resetTransform();
ctx.beginPath();
ctx.moveTo(bigTrapezoid[3][0], bigTrapezoid[3][1]);
for (const point of bigTrapezoid) ctx.lineTo(point[0], point[1])
ctx.lineTo(smallTrapezoid[3][0], smallTrapezoid[3][1]);
for (const point of smallTrapezoid) ctx.lineTo(point[0], point[1])
ctx.fill();
_assertPixel(canvas, 21,11, 0,255,0,255, "21,11", "0,255,0,255");
_assertPixel(canvas, 79,11, 0,255,0,255, "79,11", "0,255,0,255");
_assertPixel(canvas, 21,39, 0,255,0,255, "21,39", "0,255,0,255");
_assertPixel(canvas, 79,39, 0,255,0,255, "79,39", "0,255,0,255");
_assertPixel(canvas, 39,19, 0,255,0,255, "39,19", "0,255,0,255");
_assertPixel(canvas, 61,19, 0,255,0,255, "61,19", "0,255,0,255");
_assertPixel(canvas, 39,31, 0,255,0,255, "39,31", "0,255,0,255");
_assertPixel(canvas, 61,31, 0,255,0,255, "61,31", "0,255,0,255");


});
</script>